/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */

package org.apache.iotdb.db.sync.datasource;

import org.apache.iotdb.db.sync.externalpipe.operation.Operation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * This abstract class is used to manage PIPE operation block
 */
public abstract class AbstractOpBlock implements Comparable<AbstractOpBlock> {
    private static final Logger logger = LoggerFactory.getLogger(AbstractOpBlock.class);

    // StorageGroup Name
    protected String storageGroup;
    long pipeDataSerialNumber;

    boolean closed = false;

    // record First Entry's index. It is the index of all data of 1 SG.
    protected long beginIndex = -1;
    // data number of this OpBlock
    protected long dataCount = -1;

    public AbstractOpBlock(String storageGroupName, long pipeDataSerialNumber, long beginIndex) {
        this.storageGroup = storageGroupName;
        this.pipeDataSerialNumber = pipeDataSerialNumber;
        this.beginIndex = beginIndex;
    }

    public String getStorageGroup() {
        return storageGroup;
    }

    public long getDataCount() {
        return dataCount;
    }

    public void setBeginIndex(long beginIndex) {
        this.beginIndex = beginIndex;
    }

    public long getBeginIndex() {
        return beginIndex;
    }

    /**
     * return the BeginIndex of next SrcEntry
     *
     * @return
     */
    public long getNextIndex() {
        return beginIndex + dataCount;
    }

    @Override
    public int compareTo(AbstractOpBlock o) {
        return beginIndex > o.beginIndex ? 1 : (beginIndex == o.beginIndex ? 0 : -1);
    }

    /**
     * Get data from data src
     *
     * @param index
     * @param length
     * @return
     * @throws IOException
     */
    public abstract Operation getOperation(long index, long length) throws IOException;

    /**
     * release current class' resource
     */
    public void close() {
        closed = true;
    }

    ;

    public boolean isClosed() {
        return closed;
    }

    ;

    public long getPipeDataSerialNumber() {
        return pipeDataSerialNumber;
    }

    public void setPipeDataSerialNumber(long pipeDataSerialNumber) {
        this.pipeDataSerialNumber = pipeDataSerialNumber;
    }

    @Override
    public String toString() {
        return "storageGroup="
                + storageGroup
                + ", beginIndex="
                + beginIndex
                + ", dataCount="
                + dataCount
                + ", filePipeSerialNumber="
                + pipeDataSerialNumber;
    }
}
